Telautograph or facsimile telegraph.



Patented Dec. 25, |900.

A. PoLLAK. TELAUTUGRAPH 0B FACSIIILE TELEQRAPH.

(Application led Dec. 21, 1899.)

J(|Io Nadal.)

INVENTOR;

No. 6645430. Patented Dec. 25, |900.

A. POLLAK. TELAUTUGRAPH 0R FACSIMILE TELEGBAPH. I

(Application led Dec. 21, 1899.)

' (No Model.)

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UNiTED VSTATES PATENT OFFICE.-

ANToN PoLLAK, or BUDA-FESTE, AUsTRr-A-UNGARY.

TELAUTooRAPr-l on FACSIMILE TELEGRAPH;

1 srmcATIoN forming o'f Letter Patent No. 664,430, dated December 25,1906.

- origini ppnmitn nea February 1v,1s99.sen no. 705,771. No. 741,111?.

To all whom it may concern:

Be it known that I, ANTON POLLAK, a citizen of Hungary, `residing atBuda-Pesth, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Telautographs or Facsimile Telegraphs, of which the following is a specification.

This application is a-divisionV of my applicationled February 17, 1899, Serial No. 705,771.

In my application, Serial No. 681,729, filed.'

May 25, 1898, I described a telautograph', the

object of that invention beingto reproduce ,1

telegraphic messages in a form exactly correspondingwith the original.-

My present invention comprises an .improved' means for moving the ray of light along the, receiving-chamber, which means may be conveniently substituted for the rotary polygonal mirror shown in my last-named application.

-Figure 1 is a sectionalview, and Fig. 2 a plan, partly in section, of a form of apparatus shown in'my said last-named application. Fig. 3 is a plan view', partly in section, showing the preferred form of my present invention. Fig. 4 is a front elevation. Fig. 5 is a plan view, partly in section, showing the op erative connection of my device with a tel; autograph of the character shown in Figs. 1 and 2; and Fig. 6 illustrates a modification. A

I will first briefly describe the apparatus set forth in my said last-named application and its mode of operation with reference to Figs. 1 and 2.

The message a b to be sent is written, for example, upon transparent paper and mounted upon a carrier K, within which is arranged a source of light L. In front of the carriel- K is placed a screen Y, having a narrow vertical slit, preferably one-third of a millimeter in width. The image of a narrow section of the message is thus projected through the screen. vA chamber B is arranged so as to receive this imageand has at its rear a series @selenium-cells 1 2 3, dac., the height and breadth of the image being increased by the lenses C C, so that each dot of themessage substantially covers a cell. Such of the 5o' cells are illuminated as receive the rays of Divided and this application `led December 21, 1899. Serial @lo model.)

light passing through the transparent paper, While those corresponding to the'opaque lines of the-message are darkened. The cells 1 2 3,' ne., are electrically connected to a corresponding series 'of contacts 1f 2' 3', 85o., upon a commutator A.. `A brush g', carried by an arm k, is rotated by a shaft t around the series of contacts, and thus ,sends an electric current from a battery X through veach of the cells successively. Each of the cells is connected at 'i to a common line-wire-v, which leads to the receiving-station. The current passes into an electromagnet a' of a telephone -like receiver D and attracts a diaphragm f'. A small reflector d' is pivotally connected to the frame of the telephone by an arm e' and is connected to the diaphragm by a rod c'. Normally when the diaphragm is held strongly attracted the reflector is tilted, for example, downwardly, and when the attraction is decreased the reflector tilts upwardly. Thus a ray of light from the source L2 is vibrated vertically upon one side of a rotary polygonal mirror h', which in its rotation reflects the vibrating ray alonga slit z, formed in a. chamber R, in which latter is moved a photosensitive strip which receives such of the rays of light as are proand receiving apparatus are preferably so tator makes a complete revolution around its contacts while the rotary mirror h' is directing the beam of light once across the chamber R. When the current is passing through any one of the cells 1 2 3, &c.,which is illuminated, the reliector is held deilected by the attraction of the diaphragm to the magnet, so that the ray of light is directed across the chamber R below the slit z. When a dark cell is in circuit, the increased resistance of 'the selenium cell causes a diminution of the current passing over the line-wire, and the magnet thus attracts its diaphragm less strongly, and the latter moves outwardly,with the eiectof tilting the mirror upwardly.. This elevates the ray of light, so that it. rises and enters the slit z, thus making a dot on the photosensitive surface at' a position which corresponds to thatrof the darkened cell in jected through the slit z. The transmitting synchronized that the brush g' of the commuthe chamber B, and hence to the position of the dot on. the message which affected such cell.

The ray of light enters the slit z as many times during its passage'along the slit as there are darkened cells in the transmitting device,

and therefore reproduces upon the photosensitive surface each of the dots in the sec- ',tion of the message in their correct positions. As the carrier K rotates one-third of a milliof light along the slit z of the chamber R inlieu of employing the polygonal mirror h.

` The preferred construction of my invention is shown in Figs. Sto 5.

In carrying out my present invention I provide a shaft h2, which rotates synchronously with the shaft t of the comm utator A, this synchronous rotation being effected in any wellknown manner. The shaft h2 carries a disk h3, which is formed with an annular cam or screw surface, as shown. A. lever h5 is pivoted lipon a shaft h6,'and one end of this lever bears against the cam-surface of the disk h5, being held in contact therewith bya spring h4 or in any other suitable manner. ror h7 is connected to and moves with the lever h5 during the displacement of the latter by the cam.

A ray of light along the slitz of the chamber R.

When any one of the cellsl 2 3, &c., is darkened by the message, as before described, the ray of light rises and enters the slit z, thus making a dot upon the photosensitive surface. By reason of the snychronous rotation of the shaft h2 with the shaft of the commutator A such dot will correspond in position to that of the dot of the message which produced it. so proportioned that when it has swung the mirrorto the required extent the lever h5 reaches the end of the cam and drops oif the abrupt end thereof, so that the mirror h7 is suddenly swung back to its-initial position by thle tension of the spring, thus directing the ray of light against the opposite side of the chamber R and again begins its movement to lead the ray along the slit z.' This retrac- The cam-surface of the disk hs isA tion ofthe mirror takes place soiapidly that it does n ot affect the photographic record.

` If desired, the action of the mirror k7 may loe'prevented during its retractile or return movement by cutting-olf the ray of light during suchmovement or in any suitable manner. A simple means for accomplishing this result is shown, which consists of a shield hg, fixed to the shaft 7z2in such position relatively to the cam h3 that it is moved between the reiiector and the mirror at the instant the latter is retracted.

The photoseusitive surface may be moved by the shaft h2, as in the construction shown in Fig. 6, by a suitable'belt r', which acts to rotate the-roller The belt is crossed, so that it may move the film in the vappropriate direction.

lin Fig. 6 I have shown a modified construction in which the disk hsfinstead of being formed with the screw or cam-surface shown in Figs. 3 to 5, is formed on its periphery with a spiral or snail cam. In this construction lthe shaft h2 will be appropriately arranged relatively to the mirror.

What I claim is- 1. In afacsimile telegraph, a receiving instrumenthavinga swinging mirror for receiving light from a vibrating member, a cam for swinging said mirror, and means for moving said cam to impart a regular swinging movement to said mirror.

Quin a facsimile telegraph, the combination of a vibrating member, a mirror receiving a vray of light from said vibrating member, and moving it across a surface, means for moving said mirror at one rate of speed, and means for moving said mirror to a position where it can again movesaid ray of light across said surface, said last-named means acting to move said mirror at agreaterspeed than said first-named means.

3. In a facsimile telegraph, a receivinginstrument having a Swinging mirror receiving a ray of light from a vibrating member, means for swinging said mirror in one direction at one speed, and means for returning it to its original position at a faster speed.

IOO

IIO

4. In a facsimile telegraph, a receiving ini strument having a swinging mirror, for receiving light from avibrating member, means for swinging said mirror, means for returning it to its original position, and means for preventing the action its return.

5. In a facsimile telegraph, a receiving instrument having a swinging mirror, for receivin g light from a vibrating member, means for swinging said mirror, means for returning it toits original position independently of such swinging, and a s'hield for preventing the action of said mirror during its return.

6.- In receiving apparatus for telegraphing, the combination with a photosensitive surface, a source of light, a vibrating reiiector,y

and a magnet for vibrating it, of a mirror receiving light from such) reliector, and means of said mirror duringy for swinging said mirror at regular intervals to move said oscillating ray of light across said surface.

7. An apparatus for facsimile telegraphing, comprising a transmitting apparatus, consisting of a series of selenium-cells, means for projecting the inessage'upon said cells, and means for sending current impulses through said cells successively, and a receiving apparatus consisting of an electromagnet adapted to be energized by said current impulses, a reflector vibrated by said electromagnet, and moving a ra)7 of light, a photosensitive surface, and a swinging mirrorfreceiving a ray of light from such reflector, and leading it across said photosensitive surface, at regular intervals, synchronous with the recurrence of the successive transmissions of light through said series of cells at the transmitter.

8. In a facsimile telegraph,the combination of an opaque screen having an edge, a sensitive surface beyond said edge, a rapidlyvibrating member adapted to move a ray of light across the edge of said screen and said sensitive surface, and'a swinging mirror adapted to lead said oscillating ray of light along said edge.

9. In a facsimile telegraph, a receiving instru ment having a swinging mirror-h", a lever 71,5 connected to said mirror for operating it, a disk h3 formed with a cam-surface for moving said lever, a shaft h2 adapted to move synchronously with the shaft of the commutator of the transmitting-station, and a spring h4 adapted to hold said shaft h2 in contact with the cam-surface of the disk h3, whereby upon rotation of the shaft h2 the lever h5 will act to swing said mirror 71.7, until said lever reaches the end of the cam-surface upon said disk, whereupon it is suddenly retracted under the operation of its spring h4, and again commences its swinging movement.

In witness whereof I have hereunto signed my naine in the presence of two subscribing witnesses.

ANTON POLLAK. 

